Siôn ap Mihangel

Siôn ap Mihangel

Year of Call: 1998


Siôn is a specialist criminal practitioner focusing on serious crime, including murder, manslaughter, serious sexual offences, serious violence, fraud and drug conspiracies. Sion is instructed to prosecute and defend serious criminal cases and is a category 4 prosecutor for the Crown Prosecution Service.

Siôn has also developed a particular interest in firearms offences. He was recently instructed by North Wales CPS as the junior in the trial of Fitzsimmons and others (manslaughter by gross negligence) and has prosecuted and defended a number of criminal cases involving the use of firearms. In addition, Siôn regularly appears on behalf of Police Authorities in opposing Shotgun and Firearms appeals before the Crown Court.

Recent cases:

R v. Fitzsimmons and others 2018-2019 – Prosecution in a case of Gross Negligence Manslaughter.

R v. Jordan 2018 – Successful prosecution Murder

R v. Konopka 2018 – Successful Defence in a conspiracy to Blackmail

R v. Keith Jones 2018 – Defending in a large scale bus conspiracy to defraud

R v. Barnes October 2017 – Successful defence in a conspiracy to defraud

Regina v. Zack Davies – Prosecution of a white supremacist with Attempt Murder;

Regina v. O’Connor and others – Prosecution of 5 Defendants in a False imprisonment/Robbery/Kidnap/Section 18 wounding;

Regina v. Paul Hughes – Defending in Operation Yonside(major North Wales drugs conspiracy);

Regina v. Leon Thomas – Defending in Operation Measure(North Wales drugs conspiracy);

Regina v. Julius Hecko – Defence junior in Murder;

Regina v. Owen and Williams – Prosecution of two drivers for Causing death by dangerous driving;

Regina v. Lukasz Reszpondek – Prosecution junior in Murder;

Regina v. Thomas Blue – Prosecution junior in Murder.

Career History:

Siôn was a pupil at Sedan House in 1998 and was taken on as a Tenant in 1999.


  • Bar Vocational Course Cardiff University 1997-1998
  • LLB Exeter University 1994-1997

Memberships and Associations:

  • Criminal Bar Association
  • Joint Secretary of Legal Wales
  • Chester representative over 14 years call on the Management Board of the Wales and Chester Circuit

Languages: Welsh

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